Correlated Multi-Waveband Variability in the Blazar 3C~279 from 1996 to 2007

Understand

We present the results of extensive multi-waveband monitoring of the blazar 3C~279 between 1996 and 2007 at X-ray energies (2-10 keV), optical R band, and 14.5 GHz, as well as imaging with the Very Long Baseline Array (VLBA) at 43 GHz.

• In all bands the power spectral density corresponds to "red noise" that can be fit by a single power law over the sampled time scales.
• Variations in flux at all three wavebands are significantly correlated.
• The time delay between high and low frequency bands changes substantially on time scales of years.